Rac-S 33138 is the racemate of S 33138 (S080700), which acts as a preferential dopamine D3 versus D2 receptor antagonist and potential antipsychotic agent; it does not interact with histamine H1 and muscarinic receptors. Rac-S 33138 is a novel benzopyrano[3,4-c]pyrrole derivative that acts as a potent and selective dopamine D3 receptor antagonist.